Electron momentum distribution function in the t-t′-J model

被引：0
|
作者：
Ramsak, A
Sega, I
Prelovsek, P
机构：
[1] Jozef Stefan Inst, Ljubljana 1001, Slovenia
[2] Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia
来源：
PHYSICA B | 2000年 / 284卷
关键词：
electron momentum distribution; Fermi surface; t-J model;
D O I：
10.1016/S0921-4526(99)02563-6
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We study the electron momentum distribution function (EMDF) for the two-dimensional t-t'-J model doped with one hole on finite clusters by the method of twisted boundary conditions. The results quantitatively agree with our analytical results for a single hole in the antiferromagnetic background, based on the self-consistent Born approximation (SCBA). Moreover, within the SCBA an anomalous momentum dependence of EMDF is found, pointing to an emerging large Fermi surface. The analysis shows that the presence of next-nearest-neighbor (NNN) hopping terms changes EMDF only quantitatively if the ground state (GS) momentum is at (pi/2,pi 2) and qualitatively if the GS momentum is shifted to (pi,0). (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：1400 / 1401
页数：2
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